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Function to take screenshot of OS Window

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Kovid Goyal
2026-02-18 20:16:57 +05:30
parent 0dfb01e8c5
commit 5db53e8f1d
1 changed files with 34 additions and 0 deletions
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34
kitty/shaders.c
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@@ -1432,6 +1432,40 @@ setup_os_window_for_rendering(OSWindow *os_window, Tab *tab, Window *active_wind
if (start) start_os_window_rendering(os_window, tab);
else stop_os_window_rendering(os_window, tab, active_window);
}
void
take_screenshot_of_oswindow(OSWindow *os_window, unsigned char *dst_buf, unsigned *thumb_w, unsigned *thumb_h) {
unsigned vw = os_window->viewport_width;
unsigned vh = os_window->viewport_height;
*thumb_w = MIN(vw, *thumb_w);
*thumb_h = MIN(vw, *thumb_h);
size_t src_stride = (size_t)vw * 4, dst_stride = *thumb_w * 4;
RAII_ALLOC(uint8_t, buf, malloc(src_stride * (size_t)vh));
if (!buf) return;
// Read the current framebuffer (before swap)
glPixelStorei(GL_PACK_ALIGNMENT, 1);
glReadPixels(0, 0, vw, vh, GL_RGBA, GL_UNSIGNED_BYTE, buf);
glPixelStorei(GL_PACK_ALIGNMENT, 4);
// Downsample with vertical flip (OpenGL origin is bottom-left)
float x_ratio = (float)vw / (float)*thumb_w;
float y_ratio = (float)vh / (float)*thumb_h;
for (unsigned dy = 0; dy < *thumb_h; dy++) {
// Vertical flip: dst row 0 = top of image = src row (vh-1)
unsigned src_y = (unsigned)((float)(*thumb_h - 1 - dy) * y_ratio);
if (src_y >= vh) src_y = vh - 1;
const uint8_t *src_row = buf + (size_t)src_y * src_stride;
uint8_t *dst_row = dst_buf + (size_t)dy * dst_stride;
for (unsigned dx = 0; dx < *thumb_w; dx++) {
unsigned src_x = (unsigned)((float)dx * x_ratio);
if (src_x >= vw) src_x = vw - 1;
memcpy(dst_row + dx * 4, src_row + src_x * 4, 4);
}
}
}
// }}}
// Python API {{{